Vacuum milking-machine.



C. H. DAVIS.

VACUUM MILKING MACHlNE.

- APPLICATION FILED NOV. H. 1915. 1 371,544. Patented July 9,1918;

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1?? U672 for C. H. DAVIS. VACUUM MILKING MACHINE.

APPLICATION FILED NOV-11,191?

Patented July 9,1918;

\ HEE HEE 2 inventor C. H. DAVIS.

VACUUM MILKING MACHINE APPLICATION map uov. u. 1915.

Patented July 9, 1918.

. fl f! 4 SHEETSSHEET a.

Axiom C. H. DAVIS. VACUUM MILKING MACHINE.

1,271,544. APPLICATION HLED NOV. H. 1915- Patented 9 4 SHEETS-SHEET 4.

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rm: noRRls PEYFRS ca, mamuma. WAsHINGrDN. me I VACUUM 'MILKING-MACHINE.

To all whom it may concern I Be it known that I, CLAUDE HUDSON Davis, asubject of the King; of Great Britain and Ireland, and residing atNumber 10 Church Place, VVanga-nui, in the Provincial District ofWellington, in the Dominion of New Zealand, have invented a new anduseful Improvement in Vacuum Milking-Machines; and I do hereby declarethe following to be a full clear, and exact description of the same. 1

This invention relates to milking machines operated by vacuum andparticularly to that class of machine wherein the milk is automaticallyreleased by separate releasing apparatus from a I milk pipe extendingthroughout the byre.

According-to this invention two, different vacuum pressures are employedto obtain the required pulsations of the teat-cup inflation without theuse of pulsators, means being provided to alternately admit the twodifferent vacuum pressures tothe milk pipe and to release milk from thesaid pipe. One

vacuum pressure is fairly low and the other is considerably higher.

Throughout the specification the term -low vacuum or low vacuumpressure:

means an-air pressure only a few inches below that of the atmosphere.while a high vacuum or h1gh vacuum pressure means eirrleesul'econsiderably elow that e1? i Q 1 Vacuum a tank 4 f hlgh vacuum.

. .low vacuum pressure.

' The invention will be descrlbed 1n detail with the aid of theaccompanying drawings and the novel features thereof pointed out in theclaims.

On the drawings I j Figure 1 is a side elevation showing the differentportions of the machine assembled. Fig. 2 is a cross section through theclaw. Fig. 3 is a plan of the claw. Fig. 1 is a section of a milk pipecoupling.

Fig. 5 is alongitudinal section through the Fig. 8 is a similar viewthrough an ex-' haust valve taken on line 13-13 Fig. 6. Fig. 9 is apartplanof the pump. v I

Fig. 10 is an elevation partly in section of j v rod 21 driven from aneccentric 22mounted .the vacuum tanks and Specification of LettersPatent.

. teat cups 19.

Patented July 9, 1918.

Application filed November 11, 1915. Serial No. 60,893.

Fig. 11 is a plan thereof.

Fig. 12 is a sectional elevation showing how the tanks are connected tothe ejecting apparatus. i

Fig. 13 is a longitudinalsection through a relief valve employed inconnection with the vacuum tanks.

. Fig. 14 is a cross section on line CC Fig. 13.

Fig. 15 is a front elevation of the ejecting apparatus.

F ig. 16 is a cross section taken through one of the vacuum ports.

Fig. 17 is a sectional plan corresponding to line D D Fig. 16.1

Fig. v18 is a cross section taken on line E E Fig. 17.

Fig. 19 is a face. I a

Fig. 2-0 shows the position of the ports when the valve is at one end ofits stroke.

Fig. 21 shows the position of the ports when the valveis at the otherend of its stroke. 1 1.

Fig. 22 is a plan with the front valve face removed. r

Fig. 23 is a sectional elevation of a teat cup.

Referring to the drawings and first to front view of the inner valveFig. 1 the milk pipe 1 leads to the ejecting apparatus 2 which isalternately brought into communicatlon W1th a tank 3 of low mounted upona concrete basewhile a web 13 extends forwardly and is bolted to theengine frame as shown.

. The'flexible branch pipe 1 1 from the milk pipe 1 to the teat cups isconnected to a.

nipplev 15 of a milk pipe coupling 16 (see also Fig. 4:) and leads to aclaw 17 From this claw branches 18 lead to the The ejecting apparatus 2is operated by a upon a shaft 23 rotated from the motive powerin anyconvenient manner-.1

Referringnow toF'g's. 5v to-9 1nolusive the pump comprises the usualcylinder 25, piston 26, piston rod .27. and. front cover 28carrying astuffing gland 29.

A guide rod 30 is fixed to theupperside of the cylinder and upon whichrod the cross head 9 slides. A pin 31 attaches the con necting rod 8 tothe cross-head.

A passage 32 formed upon the-exterior ofthe cylinder 25 throughout thelength thereof communicates with ports 33' and 34 formed in the .cover28 and rear cover 35 respectively. Valves 36 having their stems guidedin lugs. 37 of the covers are normally restained upon theirseats by coilsprings 38 in compression between the lugs 37 and nuts 39 upon the endsof the stems.

Screw caps 40 enable the valves to be easily accessible for adjustingpurposes.

. passage 32is alsof'ormed upon the exterior of the cylinder 25 (seeFig. 8) 'and commu nicates with ports 43 in the end'covers of thecylinder. Valves 44 opening in the top posite direction to the valves 36are arranged as shown.

The, valve 44in the cover 28is not shown but is similar tothe valveshown inFig 8. An exhaust pipe 46 leads from the passage 42 (see Fig.6). V

Upon-both the inward and outward stroke of the piston air that has beendrawn from the tank 4 into the cylinder is exhausted through the valves44 into the passage 42 and into the atmosphere through the pipe 46.

Referring now to Figs. 10 to 14 the vacu um tanks 3 and 4 arecylindrical in form and have lids48 resting upon rubber rings 49. Thepipe 5 from-the pump leads to a connection50upon the tank 4 as shown.

A connection 52 having two, passages 53 and54 is fitted near the bottomof the tanks;

The passage 53 leads to the tank 4, and

the passage 54.. leads to the tank 3. The lower en-d of the connection52depends into a: neck 55 of the ejecting apparatus 2, as

clearly indicated in. Fig. 12 so that the passages 53; and 54. eachcommunlcate with a separate vacuum passage in the neck 55 as will beclearly described hereinafter.

Located. between theftwo tanks v3v and, 4

is a regulating valve 57 through which air exhaustedfrom the tank 3.This valve is.

clearly shown; inFigs. 13 an.d 1.4: andlcomprises a bush 58 fitted intothe partition 59 separating the two tanks and havingfat'apered: holeprovided init. v

Into thisbush a hollow taper plug 60 is fitted having a knurled rim 61to allow of a good grip for removingythe-plug, The taperedplug and bushenable the plug. to be easily removed for the purpose of cleaning thetanks- At the other end of the plug a valve seat is formed and carries avalve 62 the stem'63 of which is carried through the central portion 64of the plug. A spring 65 coiled around the stem 63 is in compressionbetween the portion 64 and a nut 66 screwed upon the'end of thestern 63and retains the valve normally upon its seat.

A similar valve'67 is provided upon the outer wall of the tank 3..

By regulating these valvesthe air conditions in the two chambers may. bebrought 7 to their required relative diflerence. The tank 4 beingconnected directlyto the pump- 6 will be always of high vacuum while thetank 3 may by the regulation of the valves 57 and 67 be only a fewinches below atmospheric pressure.

If desired each tank: may be made independent of the-other by connectingeachtank directly tothe suction ofthe pump 2. In this, case the reliefvalves 57 and 67 would both be located upon the outer wall of thetank's'and exposed to the atmosphere.

In Figs. 15 to 22 is illustrated the ejecting apparatus. The neck 55before referred to is part of a casting 69 having a longitudinal passage70 into one end of which the end of the milk pipe 1 is fitted. The otherend, of'the passage is closed by a plug 71. e The front of the castingis formed into a valve face 72', having rectangular ports 73 and 74leading from the passage 70 to the valve 7 face 72. Y

Passages 7 5 and 76 provided in the neck 55 lead to the valve face 72forming rec.

tangular'ports 77 and 78 therein. The connection 52 (see Fig. 12) fitsinto the two passages 75 and 76 so that the passages 75 and 76 arerespectiv ly in communication with the passages 53 and, 54. A rubberring.

7 9 makes. an air tight joint between the con:

' nection 52 and'the'neck55 (see Fig. 12.).

A sliding'valve 80 having milk ports 81' and '82 adapted to communicate.with the ports 73 and 74 respectively and also vacuum ports 83' and 84adapted to communicate respectivelywith' the ports 77 'and78 is,reciprccatedagainst the faee of the valve face 72.

Thevalve 80 is supported by a flange 86 slidable upon a'web 87 integralwith the casting 69. Pins 88 in the flange 86 retain the valve inposition. I

Hanging; pocket valves 90 and91. are .p'ivoted in lugs 92 and. 93integral ;with the front of the valve 80.. The pocket vval ve 90 coversthe ports 81 and 83 and the .valves9l covers the .ports 84. and 82.Rubber rings 95,.make an. air tight. jointbetween the/[rims of thepocketvalves and. the outer face of the valves 80. H i

Baffle plates 96 and 97 project from the frontof the valve 80 as shownsee Figs. 16,

The teat cup claw comprises a chamber 103 having a nipple 104 to whichis attached the pipe 1 1 while radial nipples 105 lead to the chamber103 and have the branches 18 attached thereto. A screw cap 106 closesthe top of the chamber 103. This construction enablesthe claw to beeasily and etfectively cleaned.

The operation of the machine is as follows:

High Vacuum obtains in the passage 7 5 from the tank 4 and lowvacuumobtains in the passage 7 6 from'the tank 3.

When the slide valveSO is in the position indicated in Fig. 21 the tank4, port 77,

pocket valve 90, ports ,81 and 73, passage and milk pipe 1 are-all incommunica' tion and have thesame air conditions exist ing-within them.The high vacuum extending to the teat cups causes the rubber'liningthereof to collapse thus extracting the milk from the teats. The milk isthen drawn along the pipe 1 into the-passage 70 and thence through theport 73linto the pocket valve 90 the bafiie plate 96 preventing the milkbeing drawn into the'vacuum port 83.

The slide valve on its return will cut off the port 73 from the'vacuumport 77 thus entrapping themilk in the pocket valve 90.-

The valve continuing its-stroke, the port 81 will be carried beyond thevalve face and be opened to the atmosphere thereby allow-' ing the valve90 to open and the milk to fiowtherefrom.

The-valve 80 in returning to the position indicated in Fig. 20 will,immediately the ports 73 and "(7 have been cut oil, bring the ports 78and 7 4 into communication, through the medium of the two ports 8st and82, and thus bring the milk pipe to the same air conditions as the tank3. Milk remaining in the pipe 1 will then be drawn through theports 74and 82 into the pocketvalve 91 whence it is released when the port 82 iseX- posed to atmosphere as in Fig. 21.

When the milk pipe is in the same air condition as the tank 3 the vacuumexisting in the teat cups will not be sufficient to collapse the rubberlining or inflation to any great extent but will be suiiicient to retainthe teat cups on the teats. The rubber lining will, therefore, return toits normal position ready to be collapsed, when the pipe 1 is at thesame air condition as the high vacuum tank 4.

The teat cup comprises an inner casing 107 having webs 108to insure apositive two sided collapsing action. An outer casing 109 havinga rubberlining 110 with its ends turned back upon the ends of the outer casingpasses over the inner casing 107. A screw cap 112 is'threaded upon theinner casingand secures the parts together.

A hole '113 is provided in the outer can: ing 109 to admit air upon theexterior oi the lining. More than one hole may be employed if foundadvisable.

The position the lining assumes when low vacuum obtains in the milk pipe1 is shown in full lines and the position the lining assumes when highvacuum obtains thereinis shown in dotted lines.

The milk pipe coupling 16 is tapered internally as shown in Fig. 4 andthe ends ofthe milk piping are fitted tightly into the tapered portions.

What I claim is 1. In a milking machine, a milk pipe to which variousmilking units are adapted to be-connected, an ejecting apparatus forreleasing milk from said pipe into the atmosphere, and two vacuum tankshaving unequal vacuum pressure obtaining therein, said ejectingapparatus alternately and intermittently admitting the vacuum from saidtanks to said milk pipe, such alternate mitting the said two differentvacuum pres sures to said milk pipe and releasing the milk from thatpipe lnto the atmosphere. 1. In amilking machlne. a milk pipe, teatcups, anv ejecting apparatus adapted to ad mit'alternately two difierentpressures of.

vacuum'to the: milk pipe to pulsate said teat-cups and draw the milktherein into said ejecting apparatus and to release the milk into theatmosphere.

5. In a milking machine, an ejecting apparatus adapted to admitalternately two difl'erent pressures of vacuum to the milk pipe and torelease milk from said pipe upon the admission of each vacuum pressureto said pipe.

6. In a milking machine, a milk pipe, two vacuum tanks, and means forobtaining unequal pressures in the tanks, in combination with ejectingapparatus, for obtaining the dual objects of admitting the said twounequal vacuum pressures alternately to the said milk pipe andreleasing!the-milk from:

said milk pipe into theatmosphere:

said ej ecting? appara tus comprising means whereby the two differentpressures are alternately admitted to said milk pipeand the milk drawninto-the said: ejectingsapt--' paratus I and ejected therefrom.

8. In a milking-unachine', 'anrejecting: ap'-"-' paratus having: a: milkpassage thereiin a mainmilk pipe connectedrwith saidwpassagep a valveface, ports from: SitlCl' 'H'lllk passage to said valve face, ports insaid valve-face communicating with a source: of. vacuum,xa slide valve"operating:- against 'saidv alve: face "and having ports control-ling?said-portsi'in said valve face, pocket valves swinging: upon theexterlor of said 'sl1de-valves,'.and means for operating said slidevalve for: bringing." the IHlZGIlOI" of said pocket valves alternatelyrinto communication wlth-the m1lk=-and-the-= vacuum ports in saidvalveface and With the atmosphere,- substantially asset forth;

9. In a milking: machine,- an ejecting ap paratus having a milk passage,amainihilk pipe connected with said passage, aivalve' face, milkports-from said milk passage to said valve face, vacuunv ports in saidvalve face communicating with the. source of! vacuum, a slide valveoperating againstijsaid 3 5 valve face, and I having ports correspondingto-the ports in saidavalve'face, pocket'valves:

swinging" upon the exterior of saidw slide valve, each of saldpocketvalves-covering. a

milk port and a vacuum i port: in" said slide:

40 valve, and means for operating; said" slide valve to connect saidpocket valves alter nately' with vacuum and openthem to=the' atmosphere,substantially as set forth;

10. In a 1nilking.-,machine,- a milk pipe, 'mcans for alternatelyadmitting: two different vacuum pressures to said milk pipe, said means"comprising. chambers into which the milk from said milk pipe isdelivered,-

and means operating whenlonechamber is open'to the-milkpipeandmilk'being drawntherein;- to "open the other? chamber toftlieatmospheresothatthe'millcentrappecl,there 7. In a milking machineoftheikindfdeascrib ed, a milkpipe, two tanks,"gmean'svvheret-' 5 J byunequal V vacuum: pressures are obtained? therein, andejecting-apparatus tov which each of said tanks i separatelycommunicates,

- low and high vacuunrarevresp ectively adapit- 6 0 ed tobeicommunicated means "adapt-edwhen one chamber is-icutofl fiom themille'pipe" to openthe: other chamber to said pipe, and 5 means":adapted. when a chamben is ':cutoil from said pipe to a lso cut o'ftthevacu'um f thereto" and 'toopen the'cliamlo'er to the atmosphere. 7

12-; In a mill "'ng machine, avacuum puntip two vacuum tanks of unequalair conditions,

the tankof high vacuum: heing-pconnected directly to the 1 vacuumpump,and ej ecting apparatus havingiwo ports connected with Y saidtanksrespectivelyfor admission of two 7 different vacuum"; pressures, a;relief valve locatedwbetweenthetwo-tanks; to draw-zair from the tank of'lowvacuum pressure; ginto thetank of highwa'cuumpres'sure, anda relie-fvalve'locatedbetween thetank of low' vacuumpre'ssure' andthe atmospheresubstantially as set forth; v

13:111 ajmilking machine, a milk pipe an ejecting apparatus having",milk passages leading to-the said milk pipe,- a-valve face to whichsaidunilk passagesilead andhaving vacuuinports-therein, a slide valvehaving milk and 'vacuuin ports therein controlling said milk passagesand vacuum ports, swing-- ingts'pocket valves covering-i'said ports inthe slide: valve; and Ebaflie-plateS projecting with 'f in: said pocketvalves between the milk and vacuum ports inwsaiid slide valves,substantiallyias-set'forth. e e Y In testimony whereof, I have signedmy? name to this specificationin the presence of two subscribingwitnesses. cIi U nHUDsonDi ivis':

Witnesses-z Y I LEO voN I-IAAs,

GORDON.

copiesofi thls patent maybewobtained rm-- 1m cents, each, -;by}addressing the: commissl'oner ot latentl,7 1 Wshing'tom-Dr03! v a i

